<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="addRoleDialogVisible = true">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom', 'vcenter', i1 === 0 ? 'bdtop' : '']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag v-for="(item3) in item2.children" :key="item3.id" type="warning" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- <pre>{{scope.row}}</pre> -->
                    </template>
                </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditRoleDialog(scope.row.id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeEditRoleById(scope.row.id)">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>

            <!-- 添加角色的对话框 -->
            <el-dialog
                title="添加角色"
                :visible.sync="addRoleDialogVisible"
                width="50%" @close="addRoleFormClosed">
                    <el-form :model="addRoleForm" ref="addRoleFormRef" :rules="addRoleFormRules" label-width="80px">
                        <el-form-item label="角色名称" prop="roleName">
                            <el-input v-model="addRoleForm.roleName"></el-input>
                        </el-form-item>
                        <el-form-item label="角色描述" prop="roleDesc">
                            <el-input v-model="addRoleForm.roleDesc"></el-input>
                        </el-form-item>
                    </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="addRoleDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="addRole">确 定</el-button>
                </span>
            </el-dialog>

            <!-- 编辑角色的对话框 -->
            <el-dialog
                title="提示"
                :visible.sync="editDialogVisible"
                width="50%" @closed="editRoleFormClosed">
                <el-form :model="editRoleForm" ref="editRoleFormRef" :rules="editRoleFormRules" label-width="80px">
                    <el-form-item label="角色名称" prop="roleName">
                        <el-input v-model="editRoleForm.roleName"></el-input>
                    </el-form-item>
                    <el-form-item label="角色描述" prop="roleDesc">
                        <el-input v-model="editRoleForm.roleDesc"></el-input>
                    </el-form-item>
                </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="editDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="editRoleInfo">确 定</el-button>
                </span>
            </el-dialog>

            <!-- 分配权限的对话框 -->
            <el-dialog
                title="分配权限"
                :visible.sync="setRightDialogVisible"
                width="50%" @close="setRightDialogClosed">
                <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="setRightDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="allotRights">确 定</el-button>
                </span>
            </el-dialog>
        </el-card>
    </div>
</template>

<script>
export default {
    data () {
        return {
            rolesList: [],
            // 添加角色的对话框的 显示与隐藏
            addRoleDialogVisible: false,
            // 添加用户的表单数据
            addRoleForm: {
                roleName: '',
                roleDesc: ''
            },
            // 添加表单的验证规则对象
            addRoleFormRules: {
                roleName: [{ required: true, message: '角色名称不能为空！', trigger: 'blur' }, { min: 2, max: 10, message: '角色名称的长度在2~10个字符之间', trigger: 'blur' }],
                roleDesc: [{ required: true, message: '角色描述不能为空！', trigger: 'blur' }]
            },
            // 编辑角色对话框的 显示与隐藏
            editDialogVisible: false,
            // 编辑角色数据
            editRoleForm: {},
            // 编辑角色的验证规则对象
            editRoleFormRules: {
                roleName: [{ required: true, message: '角色名称不能为空！', trigger: 'blur' }, { min: 2, max: 10, message: '角色名称的长度在2~10个字符之间', trigger: 'blur' }],
                roleDesc: [{ required: true, message: '角色描述不能为空！', trigger: 'blur' }]
            },
            // 分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 获取的权限数据
            rightslist: [],
            // 属性数据的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点 id 值数组
            defKeys: [],
            // 当前即将分配权限的角色id
            roleId: ''
        }
    },
    created () {
        this.getRolesList()
    },
    methods: {
        async getRolesList () {
            const { data: res } = await this.$http.get('roles')
            if (res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }
            this.rolesList = res.data
            console.log(this.rolesList)
        },
        // 添加角色按钮
        addRole () {
            this.$refs.addRoleFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post('roles', this.addRoleForm)
                if (res.meta.status !== 201) {
                    return this.$message.error('创建角色失败！')
                }
                this.$message.success('创建角色成功！')
                this.addRoleDialogVisible = false
                this.getRolesList()
            })
        },
        // 监听添加用户的关闭事件
        addRoleFormClosed () {
            this.$refs.addRoleFormRef.resetFields()
        },
        // 监听编辑用户的关闭事件
        editRoleFormClosed () {
            this.$refs.editRoleFormRef.resetFields()
        },
        // 展示编辑用户的对话框
        async showEditRoleDialog (id) {
            const { data: res } = await this.$http.get('roles/' + id)
            if (res.meta.status !== 200) {
                return this.$message.error('查询用户信息失败')
            }
            this.editRoleForm = res.data
            console.log(res)
            this.editDialogVisible = true
        },
        // 修改角色信息并提交
        editRoleInfo () {
            this.$refs.editRoleFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put('roles/' + this.editRoleForm.roleId, { roleName: this.editRoleForm.roleName, roleDesc: this.editRoleForm.roleDesc })
                console.log(res)
                if (res.meta.status !== 200) {
                    return this.$message.error('修改角色信息失败！')
                }
                this.$message.success('修改角色信息失成功！')
                this.editDialogVisible = false
                this.getRolesList()
            })
        },
        // 根据 id 删除对应的角色信息
        async removeEditRoleById (id) {
            const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }
            const { data: res } = await this.$http.delete('roles/' + id)
            if (res.meta.status !== 200) {
                return this.$message.error('删除角色失败！')
            }
            this.$message.success('删除用户成功！')
            this.getRolesList()
        },
        // 根据 id 删除对应的权限
        async removeRightById (role, rightId) {
            const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }
            const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            }
            // 重新获取列表会导致整个页面刷新
            // this.getRolesList()
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog (role) {
            this.roleId = role.id
            const { data: res } = await this.$http.get('rights/tree')
            if (res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败！')
            }
            this.rightslist = res.data
            // 递归获取三级节点的id
            this.getleafKeys(role, this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有的三级权限的 id， 并保存到 defKeys 数组中
        getleafKeys (node, arr) {
            // 如果当前 node 节点不包含 children 属性， 则是三级节点
            if (!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => {
                this.getleafKeys(item, arr)
            })
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed () {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights () {
            const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
            const idStr = keys.join(',')
            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
            if (res.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>
